KR-20260062754-A - Synchronization system and method of position sensor and hall sensor of electric shift lever system

KR20260062754AKR 20260062754 AKR20260062754 AKR 20260062754AKR-20260062754-A

Abstract

The present invention relates to a position sensor and Hall sensor synchronization system and method for an electric shift lever system, and more specifically, to a technology that provides a synchronization signal value calculated from a Hall sensor to a shift controller in the event of a position sensor failure by synchronizing a relative position sensor, a Hall sensor, with an absolute position sensor, a position sensor. The position sensor and Hall sensor synchronization system of an electric shift lever system according to the present invention comprises a shift lever sensor that detects an operation signal of a shift lever when a driver shifts a vehicle driving mode, an electric motor that switches gear stages according to the operation of the shift lever, a Hall sensor attached to the electric motor that detects a relative rotation angle, a position sensor that detects the absolute position of the electric motor, and a control unit that receives signals generated from the shift lever sensor, the Hall sensor, and the position sensor, and controls the electric motor to switch to a gear stage according to the operation of the shift lever based on the received signals. The control unit is characterized by synchronizing the position sensor and the Hall sensor and monitoring the synchronization state, and performing shift control using the synchronization signal value of the Hall sensor in the event of a failure of the position sensor.

Inventors

강지혁

Assignees

주식회사 현대케피코

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (11)

A gear lever sensor that detects the operation signal of the gear lever when the driver shifts the vehicle driving mode; An electric motor that switches gears according to the operation of the above-mentioned gear lever; A Hall sensor attached to the above electric motor and capable of detecting a rotated relative angle; A position sensor capable of detecting the absolute position of the above electric motor; Receiving signals generated from the above shift lever sensor, the above Hall sensor, and the above position sensor, A control unit that controls the electric motor to switch to a gear stage according to the operation of the gear lever based on a received signal; is included, The above control unit is, Synchronize the above position sensor and the above Hall sensor, and Monitor the synchronization status, but Characterized by performing transmission control using the synchronization signal value of the Hall sensor in the event of a failure of the above position sensor. Synchronization system of position sensor and Hall sensor for electric shift lever system
In paragraph 1, The above control unit It includes a motor drive verification unit, a synchronization sequence control unit, and a sensor fault diagnosis unit, The above synchronization sequence control unit It includes a synchronization condition checking unit, a synchronization execution unit, a synchronization status monitoring unit, and a synchronization signal value usage authorization unit, and A position sensor and Hall sensor synchronization system of an electric shift lever system, characterized in that the sensor fault diagnosis unit includes a position sensor fault diagnosis unit and a Hall sensor fault diagnosis unit.
In paragraph 2, The above synchronization condition verification unit receives information on the normality of the position sensor and Hall sensor and the motor driving status from the above sensor fault diagnosis unit and the above motor driving verification unit, and determines whether the conditions are such that a synchronization signal value can be generated. The above synchronization unit sets the position sensor value at the point in time when the synchronization signal value can be generated as an initial value, and generates a synchronization signal value by accumulating and reflecting the change amount of the Hall sensor to the initial value. The above synchronization status monitoring unit constantly monitors whether the position sensor value and the synchronization signal value are synchronized, and A position sensor and Hall sensor synchronization system of an electric shift lever system characterized by the fact that, when the synchronization status is determined to be normal, if the position sensor is faulty, the synchronization signal value usage authorization unit authorizes the use of the synchronization signal value.
In paragraph 2, Synchronization system of a position sensor and a Hall sensor of an electric shift lever system, characterized in that the above-mentioned synchronization sequence control unit further includes a synchronization fault diagnosis unit and a synchronization retry unit.
In paragraph 4, The above synchronization fault diagnosis unit determines it as a synchronization error when an abnormality in synchronization monitoring is detected, and The above-mentioned synchronization retry unit is characterized by checking whether a synchronization retry is possible and counting up the number of retries, in a position sensor and Hall sensor synchronization system of an electric shift lever system.
In paragraph 2, A position sensor and Hall sensor synchronization system of an electric shift lever system, characterized in that the above-described position sensor fault diagnosis unit diagnoses a ground-side short circuit when the position sensor value is 0%, a battery-side short circuit when it is 100%, and a range deviation when a value outside a preset normal range is displayed, and diagnoses a jump error if an abnormal change in the value is detected within the diagnosis execution cycle.
In paragraph 2, The above-described Hall sensor fault diagnosis unit determines whether a fault exists based on a Hall pattern that can be generated by a plurality of Hall sensors, and is characterized by diagnosing a Hall sensor fault by determining it as an invalid pattern if the Hall pattern is not displayed in a predetermined order as it rotates clockwise or counterclockwise, or if a pattern that violates the predetermined order or an invalid pattern is detected. This describes a position sensor and Hall sensor synchronization system of an electric shift lever system.
A synchronization condition verification step that checks whether the conditions for synchronization are satisfied based on the normality of the position sensor and Hall sensor and the motor driving status, A synchronization execution step that generates a synchronization signal value by using the position sensor value at the point where synchronization can be performed as an initial value and accumulating and reflecting the change amount of the Hall sensor to this value, A synchronization status monitoring step that monitors whether the position sensor value and the synchronization signal value are synchronized, If the synchronization status is normal in the above synchronization status monitoring step, Includes a synchronization signal value authorization step that authorizes the use of the synchronization signal value when a position sensor failure is detected. Synchronization method between position sensor and Hall sensor of electric shift lever system
In paragraph 8, In the above synchronization status monitoring step In a state where the absolute value of the result obtained by subtracting the change in the synchronization signal value from the change in the position sensor value at the time of monitoring is greater than a specific value, Determining the synchronization state as abnormal when maintained for a certain period of time Synchronization method between position sensor and Hall sensor of electric shift lever system
In paragraph 8, If the synchronization status is abnormal in the above synchronization status monitoring step, Synchronization fault diagnosis steps and Synchronization method of a position sensor and a Hall sensor of an electric shift lever system including an additional synchronization retry step
In Paragraph 10, The above synchronization failure diagnosis step and synchronization retry step Determine whether the position sensor is faulty, and if it is not faulty, Synchronization method between a position sensor and a Hall sensor of an electric shift lever system that retryes synchronization and diagnoses a synchronization failure if retries are made more than a certain number of times.

Description

Synchronization system and method of position sensor and hall sensor of electric shift lever system The present invention relates to a position sensor and Hall sensor synchronization system and method of an electric shift lever system, and more specifically, to a technology for providing a synchronization signal value calculated from a Hall sensor to a shift controller in the event of a position sensor failure by synchronizing a Hall sensor, which is a relative position sensor, with a position sensor, which is an absolute position sensor. Unlike mechanical shift lever systems that utilize mechanical link structures such as wires, electric shift lever systems perform gear shifting using electrical signals. Specifically, an electric shift lever system receives the driver's operation of the shift lever as an electrical signal, determines the desired vehicle state, and switches gears by rotating an electric motor. As such, it generates virtually no shifting shock or vibration, and unlike mechanical shift lever systems, it simplifies the connection between the lever mechanism and the transmission, thereby preventing gear shifting caused by unintended lever movement; consequently, the number of vehicles adopting this technology is on the rise. In such an electric shift lever system, the SCU (Shift Control Unit or SBW control unit) acts as the brain; it is a controller that converts shift commands issued by the driver via a button or electronic shift lever into electrical signals to control the transmission. Furthermore, to perform stable shift control, it is important to determine and control the motor's position. The electric motor used in the electric shift lever system is driven through feedback control, and the sensors utilized for this feedback control include a position sensor that detects the rotation of the motor output shaft and a Hall sensor that detects the rotation of the motor rotor. Looking at the characteristics of each sensor, the position sensor has absolute position sensor characteristics and detects the amount of rotation of the motor output shaft, allowing it to detect the actual motor position more accurately; therefore, it is used to determine the motor's current position. In addition, the Hall sensor has the characteristics of a relative position sensor by measuring the rotation angle by counting the moment it passes through the Hall element, and by transmitting the relative position of the motor rotor, the controller drives the motor with three-phase current (U, V, W) in the direction corresponding to the control command. In electric shift lever systems, as the role of sensors is critical, the implementation of a fail-safe function for each sensor failure is required. However, conventional technology does not provide a means to replace the position sensor when it fails. Therefore, if the position sensor of the electric shift lever system fails while driving, the only option is to notify the driver of the component failure and request a stop. In this case, the failure of a sensor, which is merely a single component, can lead to a situation where the entire function of the vehicle is restricted. Therefore, technology is required that can perform a backup function at the same level as when the position sensor is functioning normally, even in the event of a position sensor failure. FIG. 1 is a perspective view showing an electric shift lever system. FIG. 2 is a drawing illustrating the connection relationships of components related to a synchronization system according to an embodiment of the present invention. FIG. 3 is an overall flowchart of a synchronization method according to another embodiment of the present invention. FIG. 4 is an operation flowchart of a synchronization method according to another embodiment of the present invention. FIG. 5 is a graph showing an example of the execution of a synchronization method according to another embodiment of the present invention. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In describing the present invention, the terms used in the specification below are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. Furthermore, terms such as “comprising” or “having” in this specification are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. In describing with reference to the attached drawings, the same drawing reference numerals shall be assigned to identical components, and redundant descriptions of identical components shall be omitted. First, with reference to FIG. 1, which show